• Journal of the Korea Society of Computer and Information
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• v.29 no.1
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• pp.231-239
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• 2024

This study was conducted with the purpose of understanding the factors that influence smartphone addiction on adolescents' school adaptation. The subjects were examined with a focus on students currently attending middle schools in Gwangju Metropolitan City, and data analysis was conducted using SPSS 26.0 to examine the factors influencing school adaptation, focusing on the inducements and forced inducements that lead teenagers to fall into smartphone addiction. As a result of the analysis, it was found that anonymity and desire satisfaction among the attractive factors leading to smartphone addiction have a negative impact on school adaptation, and the forcing factors that cause adolescents to become overly dependent on smartphones include online games, online chatting, online addiction, and social interaction. It was analyzed that both action and information search had a negative impact on adolescents' school adaptation. Based on the above results, policy recommendations were presented by considering the points pointed out by the two discovered factors.

• Korean Journal of Social Welfare Studies
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• v.42 no.4
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• pp.295-327
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• 2011

Although there are many studies on the retirement recently, very few studies have empirically addressed on mandatory retirement. In Korea, several scholars suggest that the seniority systems may be the main reason that employers have been reluctant to hire older workers. Therefore, the seniority system that Lazear(1979) proposed has significant implication on explaining mandatory retirement in Korea. Thus, this study aims to examine the seniority system that Lazear proposed can explain the retired employees' mandatory retirement. The empirical study is based on Korean Longitudinal Study of Ageing. wave I-II. The main result from this analysis is that interaction between wage and job tenure on mandatory retirement is statistically significant. For employees with high wage growth rates, the probability of mandatory retirement rate is higher as their job tenure is longer. On the other hand those employees with wage growth rates, that is lower although their job tenure is longer. This study supports the assertion of Lazear(1979).

• KOREAN POULTRY JOURNAL
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• v.24 no.3 s.269
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• pp.140-142
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• 1992

브로일러를 생산하는데 있어서 환기가 매우 중요한 요인의 하나가 되는 것은 말 할 필요도 없다. 그러나 브로일러 농장의 실태를 볼 때 환기조작이 적절하지 않은 예가 있는 것으로 보인다. 중요한 것은 기상조건의 변화를 예측해 보는 것이 필요한데 이는 환기가 브로일러의 발육과 건강을 위해 이상적인 환경을 만들어 내는데 중요하기 때문이다. 사내환경이 부적절 할 때 브로일러의 발육저하가 발생되며 성장률도 나빠지고 사료효율도 저하된다. 또 깃털상태도 좋지 않아 상품의 질이 떨어져 결국 수익저하로 이어진다. 현재 국내에서 사용하고 있는 브로일러 계사는 환기가 좋지않은 경우가 많이 보이는데 커텐을 사용할 때 자연환기를 이용하는 계사에서는 주의깊은 점검을 필요로 하고 결국은 보다 안정된 환경을 공급해 주는 것이 필요하다. 현재 양계장에서 활용하고 있는 강제환기법은 기본적으로 팬을 이용해 계사내의 공기유동을 조정하는 것으로 되어 있으나 강제환기에는 계사내에 공기를 끌어들이는 방식과 계사내의 공기를 외부로 배출시켜 나가는 방식이 있다.

• The Journal of Korean society of community based occupational therapy
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• v.9 no.2
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• pp.33-42
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• 2019

Objective : The aim of this study was to evaluate the current knowledge regarding constraint-induced movement therapy (CIMT) and its application in clinical practice by physiatrists and therapists in pediatric rehabilitation area in Korea. Methods : Online survey via E-mails was sent to a total of 510 members (204 physiatrists and 306 therapists) of the Korean Society of Pediatric Rehabilitation and Developmental Medicine (KSPRDM). Results : The response rate was 35.1% (179 of 510). A total of 179 questionnaires was completed by 39 physiatrists, 89 physiotherapists, 48 occupational therapists, and 3 speech therapists. 45.8% of responders had worked over 6 years in the pediatric rehabilitation setting and a total of 58.1% (n=104) of the sample had used CIMT. The main limitations of clinically applying CIMT included limited staff and inappropriate clinical setting (35.1%, n=61), lack of understanding (19.5%, n=34), and developmental issues of function on the unaffected side (13.8%, n=24). The cooperation of patients (77.6%, n=76), cognitive/behavioral factors (42.9%, n=42), and cooperation of caregivers (25.5%, n=25) were the 3 major concerns that could be limitations with CIMT. Conclusions : Although considerable evidence supports the use of CIMT, many of physiatrist and therapists do not apply this method in practice. The improvement of limitations is necessary for wide use of CIMT in clinical practice in Korea.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.04a
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• pp.186-187
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• 2013

본 논문에서는 과부하, 과열에 의한 환풍기 동작 특성을 분석하기 위해 노후, 외부 이물질에 의한 날개의 강제 구속을 상정한 환풍기 내부 3개소의 온도 및 발화 특성을 실험적인 방법으로 분석하였다. 환풍기 신품 조건에서 날개 구속에 의한 실험 결과 온도퓨즈 용단으로 과열에 의한 변형이나 발화 위험의 징조는 발견하지 못하였으며 향후 노후 및 오염, 절연불량 등 추가적인 요인을 고려한 발화 위험의 실험이 필요하다고 사료된다.

• Fire Science and Engineering
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• v.20 no.2 s.62
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• pp.80-86
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• 2006

This study focuses on spalling phenomenon which is the one of the main issues of high strength concrete. The definition, classification and characterization, causes and the reaction mechanism of the spalling were investigated on the basis of previous literatures. The spalling phenomenon occurs when several factors such as sharp temperature increase, high water content, low water/cement ratio and local stress concentration in material combine in the concrete material. On the basis o f the factors, the preventing methods from the spalling are known as decrease of temperature increase, preventing of concrete fragmentation and fast drying of internal moisture. In this study, the controlling method of water content below some critical value was proposed as the most effective spalling-preventing method among the spalling-preventing methods. The spalling phenomenon can be prevented by adjusting the water content in the high strength concrete. Therefore, an enforced drying method is needed to decrease the water content below a critical value. Additional experimental data should be generated to determine the critical value of water content for preventing the spalling.

• The Journal of the Korea Contents Association
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• v.19 no.8
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• pp.490-499
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• 2019

Face recognition payment service is an innovative payment method based on face recognition technology and is emerging in China now. Various industries regarding unmanned sales are likely to utilize this face recognition payment service in the future. This study investigated the factors influencing the usage intention of Chinese consumers who have experience using face recognition service. We used questionnaire survey and analysis with SPSS and AMOS. According to the results of the study, conclusions are as followed. First, consumers' attitudes toward the characteristic of face recognition payment service, which are non-contact and non-coercion, positively affected perceived usefulness. Second, the rapidness of the facial recognition payment among the recognition, the security and the rapidness of this service affected the ease of use. Third, social influences such as subjective norms also influence the intention to use. Fourth, the increase of the level of self-expression awareness and the intention of using face recognition payment service are confirmed. Through these results, the implications for design and communication of related innovative services were discussed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.2
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• pp.150-160
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• 2004

This study investigates the influential factors for the user's satisfaction in usage of PDA in Korea Postal Services. This is the case of user's acceptance of information technology that organization mandatorily implements for the sake of employee's productivity. The factors examined in this study include system quality, information quality, perceived usefulness, user satisfaction, and compatibility with work. All these factors were found significant for users satisfaction. Especially, we notice the close relationship between compatibility with work, perceived usefulness, and user satisfaction in case of nonvolitional IT usage.

• Journal of Welding and Joining
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• v.4 no.1
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• pp.16-31
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• 1986

스테인레스강의 주요성능은 내식성이기 때문에 부식성의 환경에서 사용되는 일이 많다. 이 때문 에 스테인레스 강제강치에서는 부식에 관계되는 사고가 대단히 많다. 그림1(a)은 일본화학공학협 회가 1987년부터 1982년사이에 화학장치에 발생한 615건의 손상을 종류별로 분류한 것이다. 전면 부식, 공식, 동력부식균열등의 습성환경에서의 전기화학적 부식이 전체의 54%나 점하고 있 다. 이들 손상에 재료별로 보면 그림1(b)와 같이 스테인레스강이 차지하는 비율이 총 1/4에 달하 고 있다. 또한, 별도조사결과에 의하면 각종손상이 용접이음부에서 약 50% 발생하고 있어, 용접 이음부가 부식성환경에서 사용되는 경우에는 이를 부식현상과 그 방지대책을 세우지 않으면 안된다. 용접부에서 이들 부식현상이 발생하기 쉬운 것은 다음과 같은 요인으로 생각된다. (1) 용접내부는 모재와는 다른 금속조직을 가진다. (2) 용접잔류응력이 존재한다. (3) 용접결함이나 이음형식에 의한 형상불연속 놋치화하여 응력집중을 가져온다. 또한 이들이 표 면에 개구한 극간부식을 가질때에는 극간부식의 요인이 된다. 본고에서는 이들 부식현상중 가장 중요한 오-스테이나트계스테인레스강 용접부에서의 응력부식균열 현상에 대하여 설명한다.

• Management & Information Systems Review
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• v.37 no.2
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• pp.209-233
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• 2018

This study investigates the question of how political and economic factors may affect the export of renewable energy technologies. The relationships are tested using panel data for 19 OECD member countries over the period 1992-2012. Before establishing the empirical model, the current study checks the characteristics of the panel data, which includes various panel framework analyses, such as tests for the presence of normality, structural breaks, first-order autocorrelation, heteroscedasticity, cross-sectional dependence, panel unit-root. From the panel framework analyses, a dynamic panel model is established to test the relationship between the variables examined in this study. In order to reduce the bias of the estimation of the dynamic panel model and obtain efficient parameters, this study uses the bias-corrected least square dummy variable(LSDVC) estimator to estimate the empirical model. The results of this study show that governmental policies expressed as coercive pressure and market size positively affect the export growth of renewable energy technologies. However, public pressure and traditional energy industry have no significant effects on export performance. Policy implications are presented based on the results of this study.